Napa County Aerial Imagery 2025

This tiled imagery service represents a snapshot of the land surface within Napa County and is made available for public use. The tile cache scheme follows the ArcGIS Online Model. The Tile Cache was published from a mosaic dataset. This Mosaic Dataset includes all the individual geotiffs raster datasets provided to Napa County by Eagle View. Three inch coverage is limited to the City of Napa and select portions of the surrounding Napa Valley extending northwards including Lake Hennessey. A hard copy of this data is also available directly from the GIS Team. For more information, contact [e-mail]. Extent and Resolution: The imagery encompasses approximately 62 square miles of 3-inch resolution imagery and 847 square miles of 6-inch resolution imagery within Napa County, California. Capture Window: Imagery obtained between the dates of Wednesday, April 2, 2025 – Tuesday, May 6, 2025. Statement of Certified Orthomosaic Accuracy: The accuracy of the Certified Orthomosaic photography referenced herein is reported at the 95% confidence level as specified in the ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014). The 3in data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 0.75ft (22.86 cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 1.84 ft (55.96 cm) at a 95% confidence level. The 6in data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 1.30 ft (39.62 cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 3.18 ft (96.99 cm) at a 95% confidence level